My advice would be to not stop, but practice for another month and at the end of the month, assess yourself to see if you feel any better or if you still don't feel excited about training. If you are depressed, you should seek help from a health professional for that. Working out can actually be helpful to alleviate depression. Work out aerobically, hard each day and see if that doesn't life your spirits. Sometimes with loosing sleep,etc, it's easy to say more rest is needed but working out can work wonders. It can't hurt to talk to your Sensei about this feeling of burning out, he or she probably has some ideas that could be helpful. You didn't say how often you train, but you can try adjusting your training schedule to find out if this helps your situation.